The World Anti-Doping Agency said on Wednesday that another batch of athlete data has been leaked by the same Russian cyber espionage group that published confidential data earlier this week.
WADA said in a statement the hackers released data of 25 athletes from the United States, Germany, Britain, Czech Republic, Denmark, Poland, Romania and Russia.
It added that it believes this week's attacks are being carried out as retaliation for the agency's investigations that exposed state-sponsored doping in Russia.
"We condemn this criminal activity and have asked the Russian Government to do everything in their power to make it stop," WADA director general Olivier Niggli said in a statement.
"Continued cyberattacks emanating from Russia seriously undermine the work that is being carried out to rebuild a compliant anti-doping program in Russia."
On Tuesday, WADA said the hacking group known as APT28 and Fancy Bear by U.S. cyber-security researchers, was responsible for posting data about U.S. athletes Simone Biles, Elena Delle Donne, and Serena and Venus Williams.